PE loader: handle EINTR properly #21639
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open() may fail if process receives signal and open() requires blocked IO wait, like in case FS structures needed to open file are not cached at that moment. Proper way to handle such situation is to repeat operation if errno == EINTR.
Note that there're cases when Mono doing this correctly, like here: https://github.com/mono/mono/blob/main/mono/metadata/w32file-unix.c#L285 but its not doing this in the PE-loader's open(), that happen to fail sporadically with such error in our case. So this PR adds looping while (errno == EINTR) in this and similar places.